HEADREST

• US 20130229042A1
• Filed: 02/22/2013
• Published: 09/05/2013
• Est. Priority Date: 02/22/2012
• Status: Active Grant

• Current Assignee: Grammer AG (Ningbo Jifeng Auto Parts Co.,Ltd.)
• Original Assignee: Grammer AG (Ningbo Jifeng Auto Parts Co.,Ltd.)
• Inventors: KOTZ, Maximilian
• Granted Patent: US 9,555,727 B2
• Time in Patent Office: Days
• US Class Current: 297/391
• CPC Class Codes: B60N 2/806 movable or adjustable
• CPC Class Codes: B60N 2/829 characterised by their adjusting mechanisms, e.g. electric motors
• CPC Class Codes: B60N 2/865 providing a fore-and-aft movement with respect to the occupant's head
• CPC Class Codes: B60N 2/888 with arrangements for protecting against abnormal g-forces, e.g. by displacement of the head-rest
• CPC Class Codes: B60N 2/929 linear

Abstract

The invention relates to a headrest that is retained on a vehicle seat by at least one support rod (12) and that has at least one adjustment part (13) that can be moved relative to the back rest by at least one drive mechanism (14, 15, 16, 22) having at least one first drive (14, 15) that is fixed to the adjustment part and a second drive (16, 22) that is fixed to the back rest.

The special feature is that the drive (14, 15, 16, 22) has an overload safety device (17) that can be moved from a starting position into a release position when a maximum force acting on the adjustment part (13) is exceeded, and, in the release position, the drive (14, 15, 16, 22) is at least partially relieved of the force acting on the adjustment part (13).

Claims

1. A headrest that is retained on a vehicle seat by at least one support rod and that has at least one adjustment part that can be moved relative to a back rest by at least one drive mechanism having at least one first drive that is fixed to the adjustment part and a second drive that is fixed to the back rest, wherein

the drive mechanism has an overload safety device that can be moved from a starting position into a release position when a maximum force acting on the adjustment part is exceeded, and, in the release position, the drive mechanism is partially or completely relieved of the force acting on the adjustment part.

2. The headrest has claimed in claim 1, wherein the overload safety device has a coupling that can be moved from a coupling position into a decoupling position.

3. The headrest as claimed in claim 2, wherein the coupling is on the first drive or the second drive.

4. The headrest as claimed in claim 1, wherein the drive mechanism has a spindle and a spindle nut engaged by the spindle.

5. The headrest as claimed in claim 2, wherein the coupling has a spring that holds the coupling in the coupling position and, when the maximum force is exceeded, the coupling can be moved into the decoupling position by deformation of the spring.

6. The headrest as claimed in claim 5, wherein the spring is on the spindle nut.

7. The headrest as claimed in claim 5, wherein the spring is provided with first frictional connecting elements that can be engaged with second frictional connecting elements of a spring seat part in a frictionally connected releasable manner.

8. The headrest as claimed in claim 1, wherein the overload safety device has a latch that is moved from an unlocked position into a locked position by movement of the coupling from the coupling position into the decoupling position, wherein movement of the adjustment part is blocked in the locked position.

9. The headrest as claimed in claim 8, wherein the latch has at least one first locking element that is fixed to the back rest and that can be engaged with at least one second locking element that is fixed to the adjustment part.

10. The headrest as claimed in claim 9, wherein the first locking element is formed by a slide and the second locking element by gear teeth.